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首页> 外文期刊>International Journal of Rock Mechanics and Mining Sciences >Evolution of the mechanical and strength parameters of hard rocks in the true triaxial cyclic loading and unloading tests
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Evolution of the mechanical and strength parameters of hard rocks in the true triaxial cyclic loading and unloading tests

机译：真正三轴循环加载和卸载试验中硬岩机械和强度参数的演变

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摘要

Rock fracture process is associated with the degradation and mobilization of the mechanical and strength properties of rock. A number of true triaxial cyclic loading and unloading tests were carried out on three types of hard rocks (i.e., granite, marble and sandstone) to investigate the evolution of the rock properties as a function of accumulated damage. In addition to stress and strain measurements, acoustic emission (AE) signals were monitored and used to associate different stages of crack development with different stages of the mechanical and strength parameter evolution. Young's modulus and five strain increment ratios were calculated from the measured increments of stresses and strains in each cycle. It was found that hard rocks exhibited profound deformation anisotropy and directional dilation. A general trend of decreasing volumetric strain reversal stress and peak stress with increasing plastic strains was observed for all the tested specimens. The evolution of the strength properties of rock under true triaxial compression was investigated using a linear 3D hard rock failure criterion and was found to be generally consistent with the cohesion weakening and frictional strengthening concept. The influence of the intermediate principal stress on the evolution of the rock properties was also discussed.
机译：岩石骨折过程与岩石机械和强度性质的降解和动员有关。在三种类型的硬岩（即花岗岩，大理石和砂岩）上进行了许多真正的三轴循环加载和卸载测试，以研究岩石属性的演变作为累积损坏的函数。除了应力和应变测量外，监测声发射（AE）信号，并用于将不同阶段与机械和强度参数演化的不同阶段相关联。杨氏模量和五种应变增量比率从每个循环中的测量的应力和菌株的测量增量计算。发现硬岩表现出深刻的变形各向异性和定向扩张。对于所有测试的样品，观察到减少体积应变反转应力和随着塑性菌株的增加的峰值应力的一般趋势。使用线性3D硬岩破裂标准研究了真正三轴压缩下岩石强度特性的演变，并发现通常与粘合弱化和摩擦强化概念一致。还讨论了中间主应力对岩石性质演变的影响。

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